Vulnerability · Published Oct 21, 2026 · Assigned by VulnCheck
CVE-2026-114403PHPOffice PHPPresentation through 1.2.0 Deserialization via Reader\Serialized::load
High 8.1
In plain English
A high-severity unsafe deserialization in PHPPresentation from PHPOffice. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.7% (higher than 53% of all known vulnerabilities).
Severity (CVSS 3.1)8.1High
Exploit odds (30 days)0.7%top 46.5% of all CVEs
Exploited in the wildNo reportsCISA SSVC: poc
Attack toolingNoneno public tooling known
Official description
PHPOffice PHPPresentation through 1.2.0 contains an insecure deserialization vulnerability that allows attackers to instantiate arbitrary PHP objects by supplying a crafted presentation file. Attackers can upload a ZIP containing PhpPresentation.xml that IOFactory::load passes to unserialize(), enabling gadget-chain code execution, file writes, or denial of service.
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| PHPOffice | PHPPresentation | 0 – through 1.2.0 |
Weakness: CWE-502 · Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
References
- https://hackmd.io/@leediay/multiple_vulnerable_phppresentation third-party-advisory
- https://github.com/PHPOffice/PHPPresentation/blob/1.2.0/src/PhpPresentation/Reader/Serialized.php#L77-L109 technical-description
- https://github.com/PHPOffice/PHPPresentation/blob/1.2.0/src/PhpPresentation/IOFactory.php#L39 technical-description
- https://github.com/PHPOffice/PHPPresentation product
- VulnCheck Advisory: PHPOffice PHPPresentation through 1.2.0 Deserialization via Reader\Serialized::load third-party-advisory